Interesting block breaker where you build your own obstacles. With cleaned up graphics I could see this being an excellent mobile game. You may want to think about having at least 1 starting block already on the screen to draw the player's attention, it took me a but to figure out the bouncing was the source of currency. And you may want to experiment with having timed phases. So 20 seconds firing, then 20 seconds placing, then back. It may add to the excitement of the game. Unless careful strategy is what you are going for.